| 摘要 |
PROBLEM TO BE SOLVED: To improve workability when connecting/releasing a leg part of a center frame and a side frame by using a connecting pin. SOLUTION: A connecting device 22 for connecting a leg part 14 of a center frame and a side frame 17 is composed of first pin holes 15, 16 arranged on the leg part 14 side, a second pin hole 19 arranged on the side frame 17 side, a connecting pin 23 inserted into the first pin holes 15, 16 and the second pin hole 19, a compression spring 24 arranged between the leg part 14 and the connecting pin 23 and a holding means 25 for holding the connecting pin 23 in a state of being inserted into the first pin holes 15, 16 and the second pin hole 19 against the compression spring 24. Thus, when releasing a hold of the connecting pin 23 by the holding means 25, the connecting pin 23 can be pulled out of the second pin hole 19 by the compression spring 24 so as to reduce a burden of an operator when pulling out the connecting pin 23.
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